btdubz is used more orally than on writing though is not limited to just be used in speech. BTW is the actual meaning of BTDUBZ with the use of the letters B & T but using -DUBZ- as a replacement for the W

1) Oh btdubz Gerard is getting a D in AP Psychology.
2) The after party is at Don's house btdubz.
3) I'm Samantha and btdubz, I'm bipolar.
4) Muz get these sweaters. Btdubz theres cum on it.
5) Amanda has huge titties btdubz.